FreeCalypso > hg > gsm-codec-lib
diff libtwamr/d_gain_c.h @ 339:a723d9f9f697
libtwamr: integrate d_gain_c.c
| author | Mychaela Falconia <falcon@freecalypso.org> |
|---|---|
| date | Thu, 18 Apr 2024 23:33:00 +0000 |
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| children |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/libtwamr/d_gain_c.h Thu Apr 18 23:33:00 2024 +0000 @@ -0,0 +1,54 @@ +/* +******************************************************************************** +* +* GSM AMR-NB speech codec R98 Version 7.6.0 December 12, 2001 +* R99 Version 3.3.0 +* REL-4 Version 4.1.0 +* +******************************************************************************** +* +* File : d_gain_c.h +* Purpose : Decode the fixed codebook gain using the received index. +* +******************************************************************************** +*/ +#ifndef d_gain_c_h +#define d_gain_c_h "$Id $" + +/* +******************************************************************************** +* INCLUDE FILES +******************************************************************************** +*/ +#include "tw_amr.h" +#include "typedef.h" +#include "gc_pred.h" + +/* +******************************************************************************** +* DECLARATION OF PROTOTYPES +******************************************************************************** +*/ +/* +************************************************************************** +* +* Function : d_gain_code +* Purpose : Decode the fixed codebook gain using the received index. +* Description : The received index gives the gain correction factor +* gamma. The quantized gain is given by g_q = g0 * gamma +* where g0 is the predicted gain. To find g0, 4th order +* MA prediction is applied to the mean-removed innovation +* energy in dB. +* Returns : void +* +************************************************************************** +*/ +void d_gain_code ( + gc_predState *pred_state, /* i/o : MA predictor state */ + enum Mode mode, /* i : AMR mode */ + Word16 index, /* i : received quantization index */ + Word16 code[], /* i : innovation codevector */ + Word16 *gain_code /* o : decoded innovation gain */ +); + +#endif